<?php
class resizeimage
{
	// 新文件名添加后缀
	var $att;
	//图片类型
	var $type;
	//实际宽度
	var $width;
	//实际高度
	var $height;
	//改变后的宽度
	var $resize_width;
	//改变后的高度
	var $resize_height;
	//是否裁图
	var $cut;
	//源图象
	var $srcimg;
	//目标图象地址
	var $dstimg;
	//圆角源
	var $corner;
	var $im;
	function resizeimage($img, $wid, $hei,$att,$c="0", $corner_radius="5", $angle="0")
	{
       $this->att = $att;
       $this->srcimg = $img;
       $this->resize_width = $wid;
       $this->resize_height = $hei;
       $this->cut = $c;
	   $this->corner_radius = $corner_radius;
	   $this->angle = $angle;
       //图片的类型
       $this->type = substr(strrchr($this->srcimg,"."),1);
       //初始化图象
       $this->initi_img();
       //目标图象地址
       $this -> dst_img();
       //--
       $this->width = imagesx($this->im);
       $this->height = imagesy($this->im);
       //生成图象
       $this->newimg();
       ImageDestroy ($this->im);
      
	}
   function newimg()
   {
		// 如果图片本来就比设置的小，就不用绽放了。
	   if( $this->width <= $this->resize_width && $this->height<=$this->resize_height)
	   {
	   		copy($this->srcimg,$this->dstimg);
	   }
	   else
	   {
		   //改变后的图象的比例
		   $resize_ratio = ($this->resize_width)/($this->resize_height);
		   //实际图象的比例 
		   $ratio = ($this->width)/($this->height);
		   if($ratio>=$resize_ratio)
		   {
			   $newimg = imagecreatetruecolor($this->resize_width,($this->resize_width)/$ratio);
			   imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, ($this->resize_width)/$ratio, $this->width, $this->height);
			   ImageJpeg ($newimg,$this->dstimg);
		   }
		   if($ratio<$resize_ratio)
		   {
			   $newimg = imagecreatetruecolor(($this->resize_height)*$ratio,$this->resize_height);
			   imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, ($this->resize_height)*$ratio, $this->resize_height, $this->width, $this->height);
			   ImageJpeg ($newimg,$this->dstimg);
		   }
	   }
	   

   }
   //初始化图象
   function initi_img()
   {
       if($this->type=="jpg")
       {
           $this->im = imagecreatefromjpeg($this->srcimg);
       }
       if($this->type=="gif")
       {
           $this->im = imagecreatefromgif($this->srcimg);
       }
       if($this->type=="png")
       {
           $this->im = imagecreatefrompng($this->srcimg);
       }
   }
   //图象目标地址 含路径
   function dst_img()
   {
       $full_length = strlen($this->srcimg);
       $type_length = strlen($this->type);
       $name_length = $full_length-$type_length;
       $name         = substr($this->srcimg,0,$name_length-1);
	   $this->dstimg =  $name.$this->att .".".$this->type;
	   return $this->dstimg;
   }

   
   
}


?>